Saki is a large bipedal Mechasaurus standing upright, a brown scaly main body, a long tail, black nails, black padding, green chest armor, a scythe-like left hand, a pair of horns on the top of its face, and a metal plate on the top of its head.

Saki primarily uses brute force with its fangs are able to hold on and tear off armor. Its physical strength is also able to combat with the Prototype Getter Robo in its Getter 3 formation. Saki is equipped with a Getter Ray protection device, allowing it to withstand Getter Rays including the concentrated Getter Beam. Saki primarily uses its bladed claw for close combat. For ranged attacks, Saki uses a heat ray released from its mouth. Saki's nose also contains a pair of missile launcher that can only be used at close range. While never used in the anime, Saki's tail is also a powerful weapon.

To fight the threat of the Getter Rays at the Saotome Institute, Emperor Gore sent Saki to attack the labs and the unfinished Getter Robo. The Prototype Getter Robo piloted by Tatsuhito Saotome intercepted it however and engaged the Mechasaurus. Saki's defenses and brute strength put the Proto-Getter at a poor match even in its Getter 3 formation.